JPH08277786A - Rotary pump - Google Patents

Abstract

PURPOSE: To enhance efficiency with low torque by decreasing generation of abrasion, improving durability, and eliminating vibration and noise. CONSTITUTION: Passages 10 and engaging grooves 11 opening on the inner periphery are provided on a rotor 5 housed in a rotor housing chamber 2 of a casing 1, and flexible vanes 16 to be engaged with respective engaging grooves 11 are provided on an impeller 14 capable of being rotated in the eccentric position in the rotor 5. Variable displacement pump chambers 19 partitioned by the vanes 16 are formed between the rotor 5 and the impeller 14, the impeller 14 is rotated when the rotor 5 is rotated, and fluid is discharged from a suction port 3 to a discharging port 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pump, and more particularly to a vane pump in which a rotor and an impeller are integrally rotated.

[0002]

2. Description of the Related Art Conventionally well-known vane pumps accommodate a rotor in a pump chamber provided in a casing so as to rotate eccentrically, and form a plurality of slits around the rotor in a radial arrangement. A vane is housed inside so that it can move in the radial direction of the rotor, and when the rotor rotates, the tip of the vane is brought into sliding contact with the inner peripheral surface of the pump chamber by centrifugal force, and a vane is formed between the inner peripheral surface of the pump chamber and the rotor. The fluid is pumped from the suction port to the discharge port by the rotation and volume change of the partitioned volume chamber.

[0003]

By the way, in the conventional vane pump, since the tip of the vane slides in pressure contact with the inner peripheral surface of the pump chamber during operation, the tip of the vane is apt to wear and its life is short. There is.

Further, since many sliding portions are generated, a large driving torque is required, and there is a problem that vibration and noise are also generated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotary pump which can minimize the occurrence of sliding parts, prevent wear, and prolong the life of the rotary pump, and has a small driving torque and a low noise and vibration. To provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an annular rotor incorporated into a casing in which a suction port and a discharge port communicate with each other so as to rotate.
This rotor is provided with a plurality of passages penetrating in the radial direction and a plurality of engagement grooves opening at the inner diameter surface, and an impeller rotating about an eccentric axis with respect to the rotor is provided inside the rotor. The impeller has the same number of blades as the engagement groove protrudingly provided on the outer periphery, and each blade is engaged with the corresponding engagement groove,
It employs a configuration in which the rotor and the impeller rotate together.

[0007]

[Function] Between the inner peripheral surface of the rotor and the impeller, a variable volume pump chamber is formed which is partitioned by blades, and passages are in communication with each pump chamber. Therefore, when the rotor and the impeller rotate together, The volume of the pump chamber increases as it communicates with the suction port via the passage, sucks the fluid, and decreases as it communicates with the discharge port via the passage, and discharges the fluid.

Since the rotor and impeller rotate together,
The occurrence of sliding parts is small, the durability of the impeller can be improved, and since it can be configured only by rotational movement, noise and vibration are small, and vibration torque can be small.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, in the casing 1,
A circular rotor storage chamber 2 located in the center and this storage chamber 2
Suction ports 3 that are located on both sides of the storage chamber and that communicate with the storage chamber 2
The rotor 5 is provided with the discharge port 4 and is rotatably housed in the rotor housing chamber 2, and the drive shaft 7 is coupled to the boss portion 6 which is connected to one end of the rotor housing chamber 2. The end surface is covered with a lid plate 8 that rotatably supports the boss portion 6,
The other end surface is closed by a cover plate 9.

The rotor 5 is formed in a cylindrical shape having inner and outer diameters closed at one end of a concentric circle, and a plurality of passages 10 penetrating in the radial direction and a plurality of engaging grooves opening on the inner diameter surface are formed around the rotor 5. 11 and 11 are provided in an alternating arrangement at regular intervals in the circumferential direction.

On the surface of the one lid plate 9 facing the rotor 5,
An eccentric shaft 12 that is eccentric to the axial center of the rotor 5 is provided so as to project into the space inside the rotor 5.
An impeller 14 is rotatably attached to the shaft 2 via a sleeve 13.

The impeller 14 has the same number of blades 1 as the engaging grooves 11 on the outer periphery of the cylindrical portion 15 fitted on the sleeve 13.
6 are formed by radially projecting at regular intervals in the circumferential direction,
Each blade 16 has a cross-sectional shape in which a root portion connected to the cylindrical portion 15 is thick and becomes thin toward the tip, and a circular shaft portion 17 is provided at the tip. Is engaged with.

Since the impeller 14 is housed in the rotor 5 in an eccentric state, the blade 16 positioned along the eccentric direction has a fitted state in which the circular shaft portion 17 at the tip abuts on the inner end of the engagement groove 11. Therefore, on the side opposite to the eccentric direction, the circular shaft 17
Is fitted into the engagement groove 11 most shallowly, and the blade 16 and the engagement groove 1 due to the eccentricity of the rotor 5 and the impeller 14
Due to the phase difference of 1, the blades 16 located on both sides are bent in the rotation direction.

Therefore, in order to form the impeller 14 that allows the blades 16 to bend, a flexible material made of rubber or a synthetic resin having the same effect is used, or, as shown in FIG.
As shown in (b), a relatively hard and flexible material is used, and a required number of slits 18 along the length direction are formed on both side surfaces of the blade 16.
May be provided to improve the flexibility of the blade 16. The engagement groove 11 has a cross-sectional shape with a wide width on the opening side in order to prevent interference with the blade 16.

When the rotor 5 rotates counterclockwise in FIG. 1, the passage 10 has a portion communicating with the suction port 3,
The part communicating with the discharge port 4 and the part sealed by the casing 1 between these parts are moved, and the inner peripheral surface of the rotor 5 and the inside of the rotor 5 are eccentrically housed. A variable-volume pump chamber 19 partitioned by blades 16 is formed between the cylindrical portions 15 of the impeller 14,
The passage 10 communicates with each pump chamber 19.

A rotor storage chamber 2 in the casing 1
A seal 20 that slides on the outer peripheral surface of the rotor 5 is provided between the suction port 3 and the discharge port 4 on the inner peripheral surface of the, and an annular side plate 21 is provided between the impeller 14 and the cover plate 9. Assembled, seal on inner circumference of both ends of impeller 14, 22, 23
Is provided.

The rotary pump of the present invention has the above-mentioned structure. When the rotor 5 is rotated counterclockwise in FIG. 1 with the drive shaft 7 of the rotor 5 connected to a drive source such as a motor, the impeller is rotated. The blade 14 is eccentrically rotated about the eccentric shaft 12 by the engagement of each blade 16 and the engaging groove 11.

The pump chamber 19 which is formed between the rotor 5 and the impeller 14 by being divided by the blades 16 has its volume increased when it is rotated downward from the uppermost position, and the volume increases through the suction port 3 and the passage 10. Aspirate fluid while in communication.

While the pump chamber 19 moves under the suction port 3 and the discharge port 4, the fluid is trapped and the pump chamber 19
The volume of the fluid is reduced while it is rotated from the lower portion to the upper portion, and the fluid is sent out from the passage 10 toward the discharge port 4. Thus, the continuous rotation of the rotor 5 and the impeller 14 causes the fluid in FIG. As indicated by the arrow, the fluid is pumped from the suction port 3 to the discharge port 4. Since all the blades 16 of the impeller 14 are engaged with the engagement groove 11, a crescent-shaped partition plate incorporated in the space between the gears, unlike the conventional internal gear pump, is unnecessary.

In the impeller 14, during the fluid suction step and the fluid compression step, the blade 16 is in pressure contact with the engagement groove 11 due to the pressure reduction or pressure increase in the pump chamber 19.
Adjacent pump chambers 19 can be reliably cut off from each other to prevent a decrease in efficiency.

[0022]

As described above, according to the present invention, since the rotor and the impeller rotate integrally, the occurrence of sliding parts can be minimized, wear can be prevented, and durability can be improved. At the same time, since it can be configured by only the rotating portion, noise and vibration are less likely to occur, and the driving torque can be reduced.

Further, by imparting flexibility to the impeller blades, it is possible to construct a pump having excellent sealing efficiency of the pump chamber and good discharge efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a rotary pump according to the present invention.

FIG. 2 is a vertical sectional side view taken along the arrow II-II in FIG.

FIG. 3 is an exploded perspective view of a rotor and an impeller in the above.

FIG. 4A is a front view showing another example of an impeller,
(B) is an enlarged front view of the blade in the same as above.

[Explanation of symbols]

 1 Casing 2 Rotor Storage Chamber 3 Suction Port 4 Discharge Port 5 Rotor 10 Passage 11 Engagement Groove 12 Eccentric Shaft 14 Impeller 16 Blades 18 Slit 19 Pump Chamber

Claims (2)

[Claims] 1. A ring-shaped rotor is rotatably installed inside a casing in which a suction port and a discharge port communicate with each other, and a plurality of radially extending passages and a plurality of engaging grooves that open at an inner diameter surface of the rotor. And an impeller that rotates about an eccentric axis with respect to the rotor is provided inside the rotor, and this impeller has a number of blades protruding from the outer periphery that are equal to the number of the engaging grooves, and each blade corresponds to a corresponding member. A rotary pump that engages a dowel groove to rotate the rotor and impeller together. 2. The rotary pump according to claim 1, wherein the impeller blades are flexible.